At the Glee star's third annual Halloween party/birthday party (he turns 33 on Tuesday Oct. 30), held Sunday at Lure nightclub in Hollywood, Morrison and Renee Puente paid tribute to Timberlake and Spears during their legendary early aughts romance.

At the bash (sponsored by Monster High and Audi), Morrison made sure to pose for cheesy boy band photos -- and even posed with Timberlake's former bandmates, JC Chasez (dressed as a beekeeper) and JC Chasez (in a clown costume), among the revelers at the party.